Default Loop Ids And Their Associated - IBM System Storage TS3310 Setup And Operator Manual

Fibre Channel topology. The table below lists the default Loop IDs and AL_PAs for
each drive in the library.
Table 2-2. Default Loop IDs and their associated AL_PAs for Ultrium Tape Drives in the
library
9U Expansion
Note: Loop IDs are given in decimal format and AL_PA values are given in hexadecimal
format.
You can change a Loop ID by using the library's operator panel or Web User
Interface. Using a method called hard addressing, the drive then automatically
selects the corresponding AL_PA, which is the identifier that devices use to
communicate. Valid Loop ID values range between 0 and 125. The higher the
number of the Loop ID (and AL_PA), the lower the priority of the device in the
loop.
You can also specify Loop IDs that allow the drive to dynamically arbitrate the
AL_PA with other Fibre Channel devices on the loop. This method avoids conflicts
over the address and is called soft addressing. To dynamically arbitrate the AL_PA,
specify a Loop ID of 126 or 127.
For a complete list of Loop IDs and their corresponding AL_PAs, see the table
below.
Table 2-3. Valid Loop IDs and their associated AL_PAs for Ultrium Tape Drives in the library
7-bit Loop ID 8-bit AL_PA
(decimal) (hexadecimal)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
Drive
Module
Position
Control 1
Module
2
3
Module
4
5
6
7-bit Loop ID
(decimal)
X'EF' 43
X'E8' 44
X'E4' 45
X'E2' 46
X'E1' 47
X'E0' 48
X'DC' 49
X'DA' 50
X'D9' 51
X'D6' 52
X'D5' 53
X'D4' 54
X'D3' 55
X'D2' 56
Drive Location
Coordinate Default Loop ID
0, 1
0, 2
-1, 1
-1, 2
-1, 3
-1, 4
8-bit AL_PA 7-bit Loop ID
(hexadecimal) (decimal)
X'A3'
X'9F'
X'9E'
X'9D'
X'9B'
X'98'
X'97'
X'90'
X'8F'
X'88'
X'84'
X'82'
X'81'
X'80'
Chapter 2. Installation Planning
Default AL_PA
0 X'EF'
1 X'E8'
2 X'E4'
3 X'E2'
4 X'E1'
5 X'E0'
8-bit AL_PA
(hexadecimal)
86 X'4D'
87 X'4C'
88 X'4B'
89 X'4A'
90 X'49'
91 X'47'
92 X'46'
93 X'45'
94 X'43'
95 X'3C'
96 X'3A'
97 X'39'
98 X'36'
99 X'35'
2-5